Hos-sui  is the term for Living Essence of the true Buddha.

Ho = Law = Namu-myoho-renge-kyo.     Sui = water.

Shabyo is the term for pure lineage.

Sha = to put in.        Byo = container

Hos-sui Shabyo appears in the third prayer of Gongyo, the prayer
for the Three Treasures

Namu, Hos-sui Shabyo Yuigayoga...."

= same heart as Buddha
By Reverend Raido Hirota
This is NOT an official site of
the Nichiren Shoshu Shoshin-kai
Translated and edited by Udumbara Foundation staff.

This means that the water of the Law of Namu-myoho-renge-kyo is
expressed, or squeezed, and what results is the pure essence of
Namu-myoho-renge-kyo, which is then transferred to a container.
The container represents the person who has the same heart as the
Buddha and therefore understands the Buddha's true teachings. This
person is Nikko Shonin. Nikko Shonin was the only disciple who had
the same heart and mind as the Daishonin and truly understood his